Machine for the manufacture of lawn-mower knives



(No Model.)

H. G. FISKE.

MACHINE FOR THE MANUFACTURE OF LAWN MOWER KNIVES.

Patented Dec. 26, 1882.

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, pinion 1, by which itis moved to and fro,and is I 11 is a vertical transverse section at the axis .revolve freely upon the shaft 0, which roll is UNITED STATES PATENT Orrrce.

HEN )UY G. FISKE, OFsPRlNGFlELD, MASSACHUSETTS.

MACHINE FOFl THE MANUFACTURE OF LAWN-MOWER KNIVES.

SPECIFICATION forming part of Letters Patent No. 269,655, dated December 28, 1885.

Application filed October 21, 1880.

To all whom it may concern.-

Be it known that I, HENRY Gr. FISKE, of Springfield, in the county of Hampden and State of Massachusetts, have invented a new and useful Machinefor the Manufacture of Lawn-Mower Knives, which has never been patented to any person in any foreign country with my knowledge and consent,and of which the following is a specification.

The object of my invention is to furnish a machine which will give any desired number of knives for lawn-mowers the desired and uniform spiral shape, and Iaccomplish this by the mechanism substantially as hereinafter described,and shown in the accompanying illustration, in which- Figure I is a plan view of my invention. Fig.

of the main operating-shaft and through the supports of the former, and Fig. llI'is a side view of a guide which may be attached to the bed of the machine and used to assist in keeping the knife-blank in place on the former while being formed.

In the drawings, A represents the bed of the machine, which should be sufficiently heavy and solid, and which is provided at each end with bearings 10,in which is arranged to slide longitudinally the former I, which is made cylindrical for a portion of its length at each end at 9, to move freely in its bearings 10.

A heavy support, B, is firmly secured to the bed A, by bolts or otherwise, and is provided with bearings,in which is arranged to revolve a shaft,O, upon which is secured firmlya toothed wheel or pinion, 1, and a roll, D,is arranged to preferably made in sections or a series of thin rolls grouped together side by side.

' The former 1 is made spiral, and is provided with a forming-bed, 8, and with a spirally-arranged series of teeth, 18, to engage with the also provided with a spiral shoulder, 2, against which a guide, 3, bears, to give the former a rotary movement as it slides to and fro. This guide3 may be made adjustable, so as to cause the space between the forming-bed S and the roll D to be more or less, as desired.

A roll, 12, is pivoted in the forked end of a (No model.)

pivoted lever, L, and this roll 12 is located .in substantially a vertical position at the side of the forming-bed 8, the roll D being located above the forming-bed and in a position nearly at right angles to the roll 12, and the latter may consist of a. series of small rolls grouped together, if desired. f

A guard, 16, may be secured to the bed of the machine and project in between the roll D and the pinion 1, so as to prevent the blank, while beingforined, from springing up out of its proper position on the forming-bed, and a small pin may be secured in the former at the end of the forming-bed,to which to secure the blank.

A pipe,15, perforated with any desired number of small holes, is secured in position upon the hood E, and is provided with a valve for turning on and shutting off the water.

The operation of my invention is as follows: The leverL is first moved outward a little, mov ing the vertical roll 12 away from the formingbed 8, and the steel knife-blank, having first been forged or rolled into a general approximate form in its cross-section,is heated to the desired degree to be bent and tempered prop erly, and is in that condition secured to the forming bed 8 by inserting the pin in the end of thebed into a hole in the end of the blank. The shaft (J is then rotated sufficiently to move the end of the former and blank thereon in beneath the rollD,and the leverL is then moved in, bringing the roll 12 into close proximity to the forming-bed, forcing the blank down and into place to be formed on the former, and the lever may be there secured by a latch, 13, to

' hold the roll'12 in position against the blank,

and the shaft 0 is then rotated by means of thewinch 14, which moves the former 1 longitudinally and spirally against the rolls D and 12, and giving the blank the desired spiral form its entire length. As the former, and the blank thereon, moves past the roll D it is carried in beneath the hood E, between which and the formerl there is just space enough to admit the blank, thehood serving to hold the blank in position on the forming-bed while it remains beneath the hood. As soon as the blank arrives in this position beneath the hood the valve is turned, and water is admitted into the pipe 15 and issues through the small holes along the pipe directly upon the heated and formed knife, and it is thereby given the desired temper best suited for cutting purposes, and is then ready to be ground and secured in place on the mowing-machine. The former I is then run back by turning the Winch, the knife removed, and a new blank put on and the operation repeated.

Instead of the hood E being used to hold the blank down into place on the former While being hardened or tempered, a series of rolls may be used with advantage, as the former and blank will run under and into contact with the rolls with less friction than with the hood.

The particular shape of the forming-bed 8 and also that of the roll I) may be varied almost indefinitely, to adapt the machine to any desired shape of steel blanks already prepared, without departing in the least from the principle of the invention.

In order that the former maybe firmly supported between its bearings 10 and beneath the roll D while forming the knife, the support B is made to extend beneath the former, and conforms thereto sufiicienily for that purpose, as shown clearly in Fig. I[.

Having thus described my invention, what I claim as new is- 1. In a machine for forming knives for lawnmowers, a former having a spirally-arranged series of teeth and provided with a spiral shoulder, in combination with an operating pinion engaging with said teeth, and a guide engaging with said shoulder, to give the former a longitudinal and a rotary movement, at the same time, to and fro in a spiral direction, substantially as set forth. 2. In a machine for forming knives for lawnmowers, a spiral former adapted to give the desired form to the knife, and arranged to move in a direction corresponding to the direction of its forming-bed, in combination with forming-rolls for rolling the blank against the forming-bed, a holder for holding the knife in place i on the forming-bed after being formed, and a perforated water-pipe arranged to direct a. do w of water upon the formed knife before its removal from the former, substantially as set forth, and for the purpose described.

3. In a machine for forming knives for lawnmowers, a spiral former adapted to give the desired form to the knife, and arranged to move in a direction corresponding to the direction of its forming-bed, in combination with forming-rolls for rolling the blank against the form- 

